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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea49e71a366c6917e3a7a1a84a018d310b99590ff4ff156d1d5de63cd769e61' 
  AND token = 'Oo84SCOpbEjFx+gmQMlJX9uu9Go/Kxdbb6cfVnY9TcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}